Add a captcha to your customer account and affiliate registration page in order to help prevent bot and spam registrations on your site.

Using vQmod so no core file modifications are made.
Utilizing the default opencart Captcha function.

Installation:-
Extract the zip file and copy/upload the captcha_account_and_affiliate_v1.1.xml file into your website vqmod/xml directory.

*Please make sure you have the VQMOD software installed. You can download here https://github.com/vqmod/vqmod/releases